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level: Information coding systems

Questions and Answers List

level questions: Information coding systems

QuestionAnswer
Describe what parity bits areThe parity bit ensures that the total number of 1-bits in the string is even or odd
Explain how checksums are usedData from the initial block is summed, using character encoding, to create the checksum The data is sent with the checksum If the sum of the received data = checksum The sum of both is the same and its deemed correct
Describe what majority voting isError checking method of assuming the majority to be correct
Describe what checksums areA mathematical algorithm applied to a block of data
Describe what check digits areA form of redundancy check used for error detection on identification numbers which are used in an application where there will be at least some manual input
Why was Unicode introducedUnicode was designed to support characters from all languages around the world, becasue ASCII could only do english
Describe ASCIIIt is a code for representing 128 English characters as numbers, with each letter assigned a number from 0 to 127
Describe unicodeUniversal character encoding standard for characters from all languages around the world
State what character encoding isassign a number to every character that can be used
Explain how parity bits are usedDepending on wether the parity bit is even or odd, the parity bit will make the total number of 1s in the binary string be even or odd If it is supposed to be even and it is then the number is deemed correct
Explain how majority voting error checking worksEach bit is sent numerous times If there is a variation in the bits then the most frequent one is assumed to be correct